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Add support for accessing Event Queue for non-exclusive users. Allows, non-exclusive users to open Event Queues before exclusive users. Non-Exclusive users can only use the Event Queue in a read-only mode. Add VM_SHARED for Event Queues across all users instead of just Read-Only users. Event queues are shared with multiple processes and as such require VM_SHARED across all users(exclusive and observers). Jira NVGPU-8608 Signed-off-by: Debarshi Dutta <ddutta@nvidia.com> Change-Id: Id9733c2511ded6f06dd9feea880005bdc92e51a0 Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2745083 Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com> GVS: Gerrit_Virtual_Submit